Drive control unit for hydraulic elevator

Details Drive control unit for hydraulic elevator Drive control unit for hydraulic elevator

1991-11-20

1994-01-25

Stephan, Steven L.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187111, B66B 104, B66B 128

Patent

active

052817741

ABSTRACT:
A drive control unit for a hydraulic elevator comprises: an inverter for variably driving the motor; a speed detector for detecting a rotating speed of the motor; a current detector for detecting a primary current of the motor; a speed control, unit for calculating a torque command value to the motor according to a deviation between the rotating speed detected by the speed detector and a speed command value; a torque control unit for controlling the inverter according to the rotating speed detected by the speed detector, the primary current detected by the current detector and the torque command value calculated by the speed control unit; a pump pressure detector for detecting the pump pressure of the hydraulic pump; a limiting means for limiting the torque command value output from the speed control unit when the pump pressure, detected by the pump pressure detector, decreases below a set value.

REFERENCES:
patent: 4351415 (1982-09-01), Kita
patent: 4593792 (1986-06-01), Yamamoto
patent: 4686439 (1987-08-01), Cunningham et al.
patent: 4976338 (1990-12-01), Holland

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